Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

The description adds significant behavioral context beyond annotations—explaining the default browser login flow, the permanent vs session distinction, and the behavior with/without args. It does not contradict the annotations (e.g., idempotentHint=true), and even though annotations exist, the description enriches understanding of the tool's side effects and configuration.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is information-dense and front-loaded with the primary purpose, then efficiently explains two usage branches. While a bit long and run-on, every sentence contributes necessary guidance without fluff.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

For a moderately complex authentication flow, the description covers essential behaviors: how to authenticate permanently, how to do a session login, and what happens with no arguments. It does not specify return values or error handling, but that is acceptable given no output schema and the description's focus on the primary usage.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

With 0% schema description coverage Decryption for the optional 'token' parameter is excellent. The description explicitly explains that providing a token ('{ token: "<jwt>" }') performs a session-only login, while calling with no args returns the login link. This fully compensates for the lack of schema-level descriptions.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Does the description clearly state what the tool does and how it differs from similar tools?

The description clearly states the tool authenticates to MCP.AI for IDE agents (Cursor, etc.) with a specific verb ('log in') and resource, and explains the underlying flow. However, it does not explicitly contrast with sibling tools like 'connect', so it misses the differentiator for a perfect score.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Does the description explain when to use this tool, when not to, or what alternatives exist?

The description provides clear context on when to use the tool and even distinguishes permanent (server config) vs session-only login paths. However, it does not mention when NOT to use this tool or suggest alternatives, so it lacks explicit exclusions.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.